/* ===================================
   Portfolio Website Styles
   Modern/Minimalist Design
   Blue/Tech Color Scheme
   =================================== */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ===================================
   CSS Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Blue/Tech Color Palette */
    --primary-blue: #2563eb;
    --primary-blue-dark: #1e40af;
    --primary-blue-light: #3b82f6;
    --secondary-purple: #7c3aed;
    --secondary-teal: #0d9488;
    --accent-cyan: #06b6d4;

    /* Neutral Colors */
    --background: #ffffff;
    --background-alt: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: rgba(15, 23, 42, 0.08);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Layout */
    --container-width: 1200px;
    --header-height: 70px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--text-primary);
    background-color: var(--background);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-primary);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.25rem; }

p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--primary-blue-dark);
}

/* ===================================
   Header & Navigation
   =================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--background);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    box-shadow: 0 2px 8px var(--shadow);
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-tabs {
    display: flex;
    gap: var(--spacing-xl);
    position: relative;
}

.nav-tab {
    padding: var(--spacing-md) 0;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    background: none;
    border: none;
    transition: color 0.2s ease;
    position: relative;
}

.nav-tab:hover {
    color: var(--primary-blue);
}

.nav-tab.active {
    color: var(--primary-blue);
}

/* Underline Indicator */
.nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--primary-blue);
    border-radius: 2px 2px 0 0;
}

/* ===================================
   Main Content
   =================================== */

.main-content {
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

.content-section {
    display: none;
    padding: var(--spacing-lg) 0;
    max-width: 100%;
    margin: 0;
}

.content-section.active {
    display: block;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
}

/* ===================================
   About Me Section
   =================================== */

.about-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 800px;
    margin: 0 auto;
}

.profile-photo {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--primary-blue);
    box-shadow: 0 8px 24px var(--shadow);
}

.profile-placeholder {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-purple));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    font-weight: 600;
    color: white;
    box-shadow: 0 8px 24px var(--shadow);
}

.about-text {
    text-align: center;
    max-width: 600px;
}

.about-text h2 {
    margin-bottom: var(--spacing-sm);
}

.about-text p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.about-gif-container {
    width: 100%;
    max-width: 600px;
    margin-top: var(--spacing-lg);
}

.about-gif {
    width: 100%;
    height: auto;
    border-radius: 12px;
    box-shadow: 0 4px 16px var(--shadow);
}

.about-gif-placeholder {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--background-alt), var(--border));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 500;
    border-radius: 12px;
}

.contact-links {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    transition: all 0.2s ease;
}

.contact-link:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
}

/* ===================================
   Resume Section
   =================================== */

.resume-container {
    max-width: 900px;
    margin: 0 auto;
}

.resume-embed {
    width: 100%;
    height: 800px;
    border: 2px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 4px 16px var(--shadow);
}

.resume-placeholder {
    width: 100%;
    height: 800px;
    border: 2px dashed var(--border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    background-color: var(--background-alt);
}

.resume-placeholder p {
    font-size: 1.125rem;
    color: var(--text-muted);
}

/* ===================================
   Projects Section
   =================================== */

.projects-category {
    margin-bottom: var(--spacing-lg);
    padding: 0 var(--spacing-lg);
}

.category-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--border);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
}

.project-card {
    background-color: var(--background);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px var(--shadow);
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px var(--shadow);
    border-color: var(--primary-blue);
}

.project-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    background-color: var(--background-alt);
}

.project-info {
    padding: var(--spacing-sm);
}

.project-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.project-description {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* ===================================
   Project Detail Page
   =================================== */

.detail-header {
    padding: var(--spacing-xl) var(--spacing-lg);
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-purple));
    color: white;
    text-align: center;
}

.detail-header h1 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.project-category-badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.detail-content {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.detail-section {
    margin-bottom: var(--spacing-xl);
}

.detail-section h2 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.detail-section p {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.detail-section ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.detail-section li {
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 aspect ratio */
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: 0 4px 16px var(--shadow);
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tech-badge {
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: var(--background-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-blue);
}

.project-links {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.project-link-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--primary-blue);
    color: white;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.2s ease;
    border: none;
    cursor: pointer;
    text-decoration: none;
}

.project-link-btn:hover {
    background-color: var(--primary-blue-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px var(--shadow);
    color: white;
}

.project-link-btn.secondary {
    background-color: var(--background-alt);
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.project-link-btn.secondary:hover {
    background-color: var(--primary-blue);
    color: white;
}

/* ===================================
   Utility Classes
   =================================== */

.text-center {
    text-align: center;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   Placeholder Elements
   =================================== */

.placeholder-gif {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: linear-gradient(135deg, var(--background-alt), var(--border));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}